Extending the scientific foundation of the DNV GL Health Index methodology for electrical power equipment

The DNV GL Health Index translates statistical, condition and utilization data of electrical power equipment into several asset representations that show technical asset health, including expected remaining lifetimes. These remaining lifetimes are used to determine the required action for the asset manager. In this research, a method was...

Partial Discharge Recognition of Defects in Gas Insulated Systems under DC Voltage

The thesis consists of 7 chapters. The first chapter will explain the background, motivations and the general overview of the thesis. Chapter 2 is a literature review describing the physics behind the creation of PDs. The conditions necessary for the occurrence of PDs are covered in addition to an analysis of the different types of PD in GIS...

Application of Monte Carlo Simulation for risk-based decision making in MV distribution networks

Due to the liberalization of the electricity sector and the introduction of regulatory agencies to ensure service reliability, while at the same time controlling costs, distribution system operators (DSOs) are increasingly focusing on the concept of asset management. Asset management involves decision-making for investments where a balance...

Comparison of measurement methods for partial discharge measurement in power cables

Nowadays there are many partial discharge (PD) measurement systems on the market. There are systems that measure according to the IEC60270 standard (conventional measurement) and systems that don’t, the so called ‘’unconventional measurement systems’’. For PD measurement in power cables, measurement according to the standard has some...

Optimized Maintenance Planning for Transmission Power Systems

Nowadays, one of the major goals of electricity utilities is to optimize the maintenance of the assets which can be achieved by a more accurate condition indexing. The maintenance activities and maintenance planning of the grid included in this research is based on the condition indexing process. Several process steps included in the condition...

Application of Statistical Life Data Analysis for Cable Joints in MV Distribution Networks: An Asset Management Approach

The greater pressure from both customers and regulators to maintain and enhance service reliability, while at the same time controlling costs, has caused many utility distribution businesses to adopt Asset Management (AM) as their framework. Therefore, AM is widely being applied in asset intensive industries around the world. Generally, AM...

Modeling of short circuit fault arc in 150 kV system and its influence on the performance of distance protection

The short circuit arc is the most dominant fault in the power system that leads to single phase to ground fault. South Sumatera 150 kV system in Indonesia consists of two different string insulator types in the transmission line, with and without arching horn. In this study, some fault situations in that system is reconstructed by using ATP Draw...

Modeling of internal faults in three-phasethree-winding transformers for differential protection studies

The thesis describes the modeling of the internal faults in three-phase three-winding power transformer related to the differential relay protection behavior due to those faults. This transformer model is based on the mutually coupled [RL] matrix and entirely compatible with ATP/EMTP software. The model uses the real power transformer and the...

Optimization of on-site PD measurements and evaluation of diagnostic parameters for assessing condition of distribution cable system

PD diagnostic using Oscillating Wave Test System (OWTS) is very powerful measurement and very sensitive measurement. Many parameters can influence the quality of the measurement and several problems can occur during performing PD measurement. In this study, several parameters which can influence the quality of the measurement and problems...